for(int charcode:message)

Question

请允许我提一个愚蠢的问题.我目前正在做我的教程工作,但我没有得到(charcode:message)的意思.

public static void main(String[] args) {
        final int [] message = 
        {82, 96, 103, 103, 27, 95, 106, 105, 96, 28};
        //the secret message 
        final int key = 5;
        //key to unlock the message
        for (int charcode: message){
            System.out.print((char)(charcode + key));

        }
        //termincate with a newline
        System.out.println();

    }

Answer 1

它被称为foreach.它允许您轻松迭代数组中的每个元素,下面的代码将是'equivalant':

for (int i = 0; i < message.length; i++)
    System.out.print((char)(message[i] + key));

要么:

for (int i = 0; i < message.length; i++)
{
    int charcode = message[i];
    System.out.print((char)(charcode + key));
}

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